Rotary compressor or exhauster.



J. WHNSTGN.

ROTARY COMPRESSOR 0R ExHAusER.

APPLICATIQNv FIVLED .IUNE 22.11915. f

Patented July 17, 1917.

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J. JOHNSTON ROTARY COMPRESSOR OR EXHAUSTER.

APPLICATION FILED IIINE 22| 1915 Ptented July 17, 1917.

2 SHEETS-SHEET 2.

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Witnesses JOHN JOHNSTON, F LONDON, ENGLAND.

ROTARY COMPRESSOR OR EXHAVSTER.

maaar..

Speciiication of Letters Patent.

Application led J une 22, 1915. Serial No. 35,547.

To all whom it may concern:

Beit known that I, JoHN JOHNSTON, a subject of the King of Great Britainand Ireland, and residing lat 1 Victoria street, London, England, haveinvented a cert'aln new and useful Improved Rotary Compressor orExhauster, of which the .following is a specification.

'Ihis mventlon relates to an lmpr'oved r0- I tary compressor orexhauster of the type comprising two drum-'like members arranged onewithin the other and eccentrically to one another and having an annularliquid piston occupying the space between the members, the inner of saidmembers being provided with one or more helical passages through whichthe air 4or other gas being operated upon is forced from the inlet tothe outlet side of the machine. In such devices it is well known thatthe degree of compression or exhaustion depends u on the amount ofcentrifugal force" availa le for such operations in the liquid of theannular piston, this being determined for a given speed ofrotation bythe extent of 4the '1mmersion in the liquid of the helical passage orpassages. 1

It has heretofore been proposed to increase the eectiveness of themachine by making the inner member tapered or conical in such a manneras to increase the depth of immersion in the liquid of the helicalpassage through which the [gas passes,

but such a construction su'ers from the grave disadvantage that awedgingfaction takes place between the tapered member and the liquidwith the result that the outerl casing is often subject to very greatstresses and may be liable to burst.

The object of the present invention is to devise an improved form ofmachine of the kind -v first above referred to having the advantages ofthe second type of apparatus mentioned without its attendantdisadvantages, and the invention consists in a compressor or exhausterof the type first above referred to comprising in combination an outercasing, an inner cylindrical rotary member having one or more helicalpassages thereon and a shrouding plate formed or fitted upon one or eachside of the inner member.

The invention also comprises means for maintaining constant the amountof liquid within the machine. s

The invention still further comprises 'the z particular form of machinehereinafter described with reference to the accompanying drawings inwhich A Figure 1 is a transverse` sectional elevation illustrating oneconvenient form of machine 1n accordance with themventmn Patented ItalyIt', IHM.

applicable more particularly as an exhauster.

Fig. 2 is a View illustrating partly in end elevation and partly insectional elevation on the line C-D the machine illustrated in Fig. 1.

' In carrying my invention into ed'ectin one convenient'manner asillustrated in its application to an exhauster, I provide any suitableform of framework or foundation a for the machine having brackets bthereon for carrying the bearings c, al ofthe outer and inner membersrespectively (when both are to vbe rotated) the bearings being disposedsymmetrically about the center line of the machine as shown or beingarranged so that the members. may be overhung or in any other suitablemanner. The outer member e is .as is usual in the form of ahollow drum'or casing and the inner member is cylindrical in form and in theparticular construction illustrated is constructed in two parts q eachof which is provided with two threads g, the threads in the one casebeing' right-handed and in the other case left-handed so that the air orgas to be extracted -by the machine will be drawn through the hollowshaft m by way of the interior ofthe inner member and through "theapertures p to be fed\-alongfthe inner Vmember to the outer surfacesthereof.

The two parts g of the inner member are 4connected by intermediate websr and the that the shrouding plates will provide for an increasedimmers1on of the inlet or outannular piston, thuscausing the gas to beacted upon by an increased centrifugal force and increasing the degreeof exhaustion or compression-obtainable. l y

' The shrouding plates are conveniently made somewhat shorter tha-n thestroke of `let for the air \or gas in the liquid of the 'A i otherwisesuitably arranged .modify different parts to suit the purpose for whichthe machine in order to leave -a dischar e passage between their edgeand the liquid piston at the outer part of the stroke.

The water or other liquid that is to form the annular piston may beintroduced into the space between the two members by the nozzle L andsuitable means may be adopted for maintaining constant the amount ofliquid within the machine as, for example, I may provide an outlet scoopn for this purpose, the scoop being pivotally mounted or so that itsposition may be readily varied depending upon the quantity of liquidthat is to be main'- tained within the machine.

The yspiral vanes formed in one with the inner drum-like member or theymay be suitably secured thereto in any the purpose of rotating theannular liquid piston between the' members I prefer to provide thethread-or threads with a series of intermediate transverse vanes Vorpaddles o which may be secured in slots in the threads or in any othersuitable manner.

For certain purposes it may be found advantageous to arrange the innerdrum to run. free while the outer drum is adapted to be power-driven orthe converse arrange-v ment may b'e adopted in which the inner drum ispower-driven and the outer drum allowed to run free, or for somepurposes the outer drum may even be fixed, and it will be understoodthat in general a machine constructed in accordance with this inventionmay be adapted to work either as a compressoror as an exhausterdepending upon -its direction of rotation.

It is to be understood that I donot desire to confine my invention tothe particular construction of inner and outer Imembers hereinbeforereferred to provided always that the inner member is of substantiallycylindrical form and provided with a shrouding plate or plates, and Isuitably the size and arrangement of the the device is to be employed,varying also the materials from which the various parts are constructed.l

Having now -described my invention what I- claim as new and desire tosecure by LettersPatent is A rotary compressor or exhauster compr1s1ngincombination an outer rotary member, an inner rotary member eccentricthereto and formed with a helicalpassage, a cen'- trifugally held bodyof'liquid between said members and a shrouding plate upon one side faceof the inner member.

2. A rotary compressor or exhauster comprising in combination an louterrotary member, an' inner rotakry member eccentric thereto and formedwith a helical passage, a centrifugally held body of liquid between orblades g may be' convenlent manner and for,

,outer surface of the inner said members and a shrouding plate upon eachside face of the inner member.

3. A rotary compressor or exhauster comprising in combination an outerrotary member, an inner rotary member eccentric thereto and formed witha helical passage, means for admitting liquid into the space betweensaid members, a shrouding plate upon one side face of said inner memberand Y means for maintaining substantially constant the amount of liquidbetween said members.

4. A rotary compressor or exhauster comprising in combination an outerrotary member, an inner rotary member eccentric thereto and formed witha helical passage, means for admitting liquid into the space betweensaid members, a shrouding plate upon each s1de face of said innerlmember and means for maintaining substantially constant the amount ofliquid between said members.

5. A rotary compressor or exhauster com-4 prising an outer rotarymember, an inner rotary member arranged eccentrically to 'said outermember, a helical vane upon saidl inner mem'ber, means for supplyingliquid to the space between said members and a shrouding plate upon oneside face of saidinner member.

6. A rotary compressor or exhauster comprising an outer rotary member,an inner `rotary member arranged eccentrically to parts and havingcommunication with the two opouter surface of the inner member, positelydisposed helical vanes upon said inner member, a centrifugally held bodyof liquid between said members, means for driving said inner member anda shrouding plate upon each side face of -said inner member.

8. A rotary compressor or exhauster comprising an outer rotary member,an inner rotary member formed in two parts inclosing a chamber or hollowspace between said parts and having communication with the i member, twooppositely disposed helical vanes upon said innerJ member, means forsupplying liquid to the space between said members, 'a shrouding plateupon each side face of said inner member and means for maintainingsubstantially constant the amount of liquid betweenl said members.

9. A rotary compressor or exhauster comprising an outer rotary member,an inner rotary member arran ed eccentrically there-I to, two oppositelyisposed helical vanes upon said inner'xnemb'er, ahollow shaft carryingsaid member and communicating with a chambery formed withinsaid innermember, means for driving said inner member, a shrouding plate uponeachside face of said inner memberand a centrifugally held body of liquidbetween said members.

l0. A rotaryfcompressor or eXhauster comprising anvouter.l rotarymember, an inner rotary member arranged eccentrically thereto, twooppositely disposed helical vanes upon said inner mem'ber, a hollowshaft carrying said member and communicating with a chamber formedwithin said inner meinber,.means for driving said .inner member, meansIforfsuppl'ying liquid to the space between said members, n'rrans formaintaining substantially constant the amount of liquid within themachine, a s hrouding plate upon each Asidebface of said inner member,and a upon said inner member, a hollow shaft carrying sald memberand/communicating with a. chamber formed within y said inner member,means lfor driving said innermem'- ber, means for supplying liquid tothe s pacenbetween said members, an adjustable scoop for maintaininsubstantially constant ,the amount of liqui within the machine, ashrouding plate upon eachsideface of said innermember, and-acentriugally held body v of liquid between said members.

In testimony whereof l' have signed lmy,

name to this speciieation;

.Centrifuga'uy held body or lliquid between Jol-m Jontrs'rofn.'

